SAA7780 datasheet(22/70 Pages) PHILIPS

22 / 70 page

ThunderBird Q3D PCI Audio

SAA7780

Accelerator

Philips Semiconductors

Product Specification

1999 Sep 30

MIDI Interface

PLL/DSP CLK Subsystem Interface

DSP External Memory Interface

MIDIIN

I-T

MIDI Serial Data Input

This signal is part of the standard 2 wire MIDI interface. This input

receives MIDI data at a rate of 31.25Kbaud. Optical isolation is

required.

MIDIOUT

O-T

MIDI Serial Data Output

This signal is part of the standard 2 wire MIDI interface. This output

transmits MIDI data at a rate of 31.25Kbaud. Optical isolation is

required.

XTALIN

XTALOUT

I-C

O-C

OSC Clock Crystal Pad

This pin pair describes the pad required for the 14.31818MHz OSC

pad oscillator. The OSC clock is used to provide a fixed timebase for

many functions within the SAA7780 device.

DSPCLK

I-T

DSP Clock Input

This pin can be used as the clock input for the SAA7780 for the DSP

subsystem in place of the PLL driving the clock. DSPCLK is also

used to drive the DSP subsystem for controllability during testing.

PSUB

AGND

PLL Substrate

PLLDPWR

DPWR

PLL Digital Power

PLLDGND

DGND

PLL Digital Ground

PLLAPWR

APWR

PLL Analog Power

PLLAGND

AGND

PLL Analog Ground

MA[14:0]

143,141,140,

139,137,136,

134,132,131,

130,129,127,

126,125,124

O-T

External Memory Address

Address lines for the external SRAM devices. The external memory

interface can be used for DSP code space if the EXT_SRAM_EN (in

HDCFG, bit 5) is set. Otherwise, the reverb accelerator will use the

external SRAM.

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